Can't say much for me or any siblings (they don't play games) but I have a few stories about my niece.

My niece, about four years old then (a year ago?) was watching me play KH1. I had just finished a colosseum battle and pushed pause. It paused while Donald was jumping into the air, and only Donald's bottom was visible. My niece saw this and laughed "It's Donald's pee-pee!"

On another occasion, my mom, my niece and I were in a store. My niece picked up a pair of knitting needles, crossed them over her head and proclaimed, "That's the power of the keyblade!"